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Before proceeding anymore a few disclaimers:

The metagame for X/Y is still forming, there's no guarantee which move will becom popular when. Like earlier, Boomburst Exploud/Chatot/Noivern were uncommon, but now they have become noticeably commoner.

I depends on the tier, each tier has different popular moves, like Geomancy being popular in Ubers but almost non-existant in OU.

Most of this is personal opinion, which can vary from person to person.

Deoxys-S, Greninja, Kyurem-B, Manaphy are the main ones in OU. Some Specially-based/Mix Tyranitars may also run Ice Beam
If you look at other tiers (Because like Weavile and Donphan are not ou either >.>), Kyogre in Ubers, anything like Kingdra, Articuno, occasionally Mega-Blastoise, Goodra, Clawitzer, Ludicolo etc. in the lower tiers will almost always run it.